<template>
  <div class='home-category'>
    <ul class="menu" v-if="list.length > 0">
      <li v-for="item in list" :key="item.id">
        <RouterLink to="/">{{item.name}}</RouterLink>
        <RouterLink v-for="it in item.children" :key="it.id" to="/">{{it.name}}</RouterLink>
        <div class="layer">
          <!-- 弹层 -->
          <h4>分类推荐 <small>根据您的购买或浏览记录推荐</small></h4>
          <ul>
            <li v-for="it in item.goods" :key="it.id">
              <RouterLink :to="`/goods/${it.id}`">
                <img :src="it.picture" alt="">
                <div class="info">
                  <p class="name ellipsis-2">{{it.name}}</p>
                  <p class="desc ellipsis">{{it.desc}}</p>
                  <p class="price"><i>¥</i>{{it.price}}</p>
                </div>
              </RouterLink>
            </li>
          </ul>
        </div>
      </li>
    </ul>
    <!-- 没有数据，就先展示骨架屏 -->
    <template v-else>
      <!-- 结构要和真实数据一致
       -->
       <ul class="menu">
         <li v-for="i in 9" :key="i">
            <XtxSkeleton :width="40" :height="20" bg="rgba(255,255,255,0.2)" style="margin-right:5px"/>
            <XtxSkeleton :width="50" :height="20" bg="rgba(255,255,255,0.2)" style="margin-right:5px"/>
            <XtxSkeleton :width="50" :height="20" bg="rgba(255,255,255,0.2)" style="margin-right:5px"/>
         </li>
      </ul>
    </template>
  </div>
</template>

<script>
import { useStore } from 'vuex'
import { computed } from 'vue'
export default {
  name: 'HomeCategory',
  setup () {
    const store = useStore()
    // 从vuex拿数据，渲染到页面
    // vuex的数据不好直接使用，要裁剪一下
    // 提示：可以在vue的调试工具中，选择组件，查看
    const list = computed(() => {
      const category = store.state.category.list.map(item => {
        return {
          id: item.id,
          name: item.name,
          goods: item.goods,
          // chilren太多了，只要前两个
          children: item.children.slice(0, 2)
        }
      })
      console.log(category)
      return category
    })

    return { list }
  }
}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 450px;
  background: rgba(0,0,0,0.8);
  position: relative;
  z-index: 99;
  .menu > li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      &:hover {
        background: @xtxColor;
      }
      &:hover {
        // 鼠标悬停显示
        .layer {
          display: block;
        }
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }

  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255,255,255,0.8);
    position: absolute;
    left: 250px;
    top: 0;
    // 初始隐藏
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
              width: 95px;
              height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
  }
}
</style>
